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Internet of Things.Enabled DDos.Attack Detection Us.ng Pigeon Ins.ired Optimization Algorithm with Deep Learning Approach

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CMC-COMPUTERs.MATERIALs.& CONTINUA 2024年第3期80卷 4047-4064页

作者： Alghamdi, Turki Ali Alotaibi, s.ud s. Umm Al Qura Univ Coll Comp Dept Comp Sci & Artificial Intelligence Mecca 21955 Saudi Arabia

Internet of Things.(IoTs. provides.better s.lutions.in various.fields. namely healthcare, s.art trans.ortation, home, etc. Recognizing Denial of s.rvice (Dos. outbreaks.in IoT platforms.is.s.gnificant in certifying the acces.ibility and integrity of IoT s.s.ems. Deep learning (DL) models.outperform in detecting complex, non-linear relations.ips. allowing them to effectually s.vere s.ight deviations.from normal IoT activities.that may des.gnate a Dos.outbreak. The uninterrupted obs.rvation and real-time detection actions.of DL participate in accurate and rapid detection, permitting proactive reduction events.to be executed, hence s.curing the IoT network's.s.fety and functionality. s.bs.quently, this.s.udy pres.nts.pigeon-ins.ired optimization with a DL-bas.d attack detection and clas.ification (PIODL-ADC) approach in an IoT environment. The PIODL-ADC approach implements.a hyperparameter-tuned DL method for Dis.ributed Denial-of-s.rvice (DDos. attack detection in an IoT platform. Initially, the PIODLADC model utilizes.Z-s.ore normalization to s.ale input data into a uniform format. For handling the convolutional and adaptive behaviors.of IoT, the PIODL-ADC model employs.the pigeon-ins.ired optimization (PIO) method for feature s.lection to detect the related features. cons.derably enhancing the recognition's.accuracy. Als., the Elman Recurrent Neural Network (ERNN) model is.utilized to recognize and clas.ify DDos.attacks. Moreover, reptile s.arch algorithm (Rs.) bas.d hyperparameter tuning is.employed to improve the precis.on and robus.nes. of the ERNN method. A s.ries.of inves.igational validations.is.made to ens.re the accomplis.ment of the PIODL-ADC method. The experimental outcome exhibited that the PIODL-ADC method s.ows.greater accomplis.ment when related to exis.ing models. with a maximum accuracy of 99.81%.

关键词： Internet of things denial of s.rvice deep learning reptile s.arch algorithm feature s.lection

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His.orical Changes.and Multi-s.enario Prediction of Land Us. and Terres.rial Ecos.s.em Carbon s.orage in China

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Chines. Geographical s.ience 2024年第3期34卷 487-503页

作者： AN Yue tan Xuelan REN Hui LI Yinqi ZHOU Zhou College of Res.urces Hunan Agricultural UniversityChangsha 410128China s.hool of Geographic s.ience Hunan Normal UniversityChangsha 410081China

Terres.rial carbon s.orage(Cs.plays.a crucial role in achieving carbon balance and mitigating global climate *** s.udy employs.the s.ared s.cioeconomic Pathways.and Repres.ntative Concentration Pathways.s.Ps.RCPs.publis.ed by the Intergovernmental Panel on Climate Change(IPCC)and incorporates.the Policy Control s.enario(PCs.regulated by China’s.land management *** Future Land Us. s.mulation(FLUs.model is.employed to generate a 1 km res.lution land us./cover change(LUCC)datas.t for China in 2030 and *** on the carbon dens.ty datas.t of China’s.terres.rial ecos.s.ems.the s.udy analys.s.Cs.changes.and their relations.ip with land us. changes.s.anning from 1990 to *** findings.indicate that the quantitative changes.in land us. in China from 1990 to 2020 are characteris.d by a reduction in the area proportion of cropland and gras.land,along with an increas. in the impervious.s.rface and fores. *** changing trend is.projected to continue under the PCs.from 2020 to *** the s.Ps.RCPs.s.enario,the proportion of cropland and impervious.s.rface predominantly increas.s.while the proportions.of fores. and gras.land continuous.y *** los. in China’s.carbon s.orage from 1990 to 2020 amounted to 0.53×10^(12)kg,primarily due to the reduced area of cropland and *** the s.Ps.RCPs.s.enario,more s.gnificant carbon los. occurs.reaching a peak of8.07×10^(12)kg in the s.P4-RCP3.4 *** los. is.mainly concentrated in the s.utheas.ern coas.al area and the Beijing-TianjinHebei(BTH)region of China,with urbanis.tion and defores.ation identified as.the primary *** the future,it is.advis.ble to enhance the protection of fores.s.and gras.land while s.abilis.ng cropland areas.and improving the intens.ty of urban *** res.arch findings.offer valuable data s.pport for China’s.land management policy,land s.ace optimis.tion,and the achievement of dual-carbon targets.

关键词： land us. change Future Land Us. s.mulation(FLUs.model carbon s.orage carbon dens.ty datas.t land us. s.enario China

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Impact of climate change on food s.curity in the Central As.an countries

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s.ience China Earth s.iences 2024年第1期67卷 268-280页

作者： Fang s. Yu LIU Lvfan CHEN Rus.am OROZBAEV Liangcheng tan s.hool of Economics.and Management Northwest UniversityXi’an 710127China s.hool of Economics.and Management Shaanxi University of Science and TechnologyXi’an 710021China s.ate Key Laboratory of Loes. and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China Ins.itute of Geology National Academy of Sciences of Kyrgyz RepublicBishkek 720040Kyrgyzstan Ins.itute of Global Environmental Change Xi’an Jiaotong UniversityXi’an 710049China

The current and potential impacts.of global warming have generated wides.read concerns.about food s.curity among all s.ctors.of *** As.an countries.located deep in the interior of As.a with fragile ecological environments.and lower agricultural technology are particularly more prone to s.vere threats.from climate *** on panel data acquired in five Central As.an countries.from 1990 to 2019,a C-D-C model was.developed to s.udy how climate change affects.food s.curity in the region and to predict future *** s.udy found that the level of food s.curity has.generally increas.d for thes. five Central As.an countries.over the pas. 30 years.with Kazakhs.0} and Tajikis.0} having the highes. and lowes. food s.curity levels.*** average annual temperature and precipitation exhibit an inverted U-s.aped relations.ip with the region’s.food s.curity,with the mos. pos.tive effect on the food s.curity of *** high and low temperatures.have s.gnificantly affected food s.curity in the s.udied region,with Turkmenis.0} experiencing the mos. s.gnificant negative *** number of fros. days.had no s.gnificant effect on food *** analys.s.of future climate s.owed that the temperature and precipitation in Central As.a will continue to increas. from 2030 to 2090,which will negatively impact the food s.curity of thes. *** is.recommended that the Central As.an countries.enhance their unders.0}ding of climate ris.s.s.rengthen s.ientific climate res.arch,and develop multiple adaptation s.rategies.in ***,they are encouraged to cons.lidate international cooperation,reducing greenhous. gas.emis.ions.effectively and maintaining the ability to ens.re food s.curity.

关键词： Global warming Extreme climate Food s.curity Future forecas.s Five Central As.an countries

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s.lf-as.embled amphiphilic NIR-Ⅱ emis.ive nano-micelles.for imaging-guided photothermal therapy of colorectal cancer

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s.ience China Chemis.ry 2024年第8期67卷 2767-2774页

作者： Axin He Fangfang Xia Da Han Qinglai Yang Weihong tan Ins.itute of Molecular Medicine(IMM) Renji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200240China Center for Molecular Imaging Probe Hunan Province Key Laboratory of Cancer Cellular and Molecular PathologyCancer Research InstituteHengyang Medical SchoolUniversity of South ChinaHengyang 421001China The Key Laboratory of Zhejiang Province for Aptamers.and Theranos.ics Zhejiang Cancer Hospital Hangzhou Institute of Medicine(HIM)Chinese Academy of SciencesHangzhou 310022China Molecular s.ience and Biomedicine Laboratory(MBL) State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringCollege of BiologyAptamer Engineering Center of Hunan ProvinceHunan UniversityChangsha 410082China

Colorectal cancer(CRC) is.one of the major caus.s.of cancer-related mortality worldwide. Mos. near-infrared(NIR) agents.us.d in clinical CRC treatment are at NIR-I(700–900 nm) window, which has.limitations.on deep tis.ue, and fluores.ent probes.in the s.cond NIR(1,000–1,700 nm) allow high-res.lution bioimaging with deep tis.ue penetration. However, exis.ing NIR-II fluorophores.us.d in clinical are s.ill rare. Herein, bas.d on s.ielding-donor-acceptor-donor-s.ielding(s.D-A-D-s. s.affold, we developed an organic s.all-molecule fluorophore IR-BTGP with NIR-II emis.ion for imaging-guided photothermal therapy(PTT) in CRC mice model. Amphiphilic IR-BTGP can be s.lf-as.embled into s.herical nano-micelles. which pres.nts.reliable water s.lubility and photothermal convers.on efficiency(30.2%). In vitro experiments.indicate that cancer cells.treated with IRBTGP were s.gnificantly killed upon 808 nm light irradiation. Furthermore, in vivo NIR-II fluores.ence imaging confirms.that IR-BTGP accumulates.in the tumor region. Remarkably, a s.gnificant tumor inhibition rate(78.5%) was.obs.rved in tumorbearing mice when treated with IR-BTGP plus.808 nm irradiation. Therefore, this.work s.ows.that IR-BTGP holds.great promis. as.an NIR-II fluores.ence imaging-guided PTT platform for CRC in the future.

关键词： photothermal therapy(PTT) s.cond near-infrared(NIR-Ⅱ)imaging organic molecule

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Three-dimens.onal numerical manifold method for heat conduction problems.with a s.mplex integral on the boundary

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s.ience China(Technological s.iences. 2024年第4期67卷 1007-1022页

作者： TONG DeFu YI XiongWei tan Fei JIAO YuYong LIANG JiaWei Faculty of Engineering China University of GeoscienceWuhan 430074China Department of Civil Engineering Monash UniversityMelbourne VIC 3800Australia Badong National Obs.rvation and Res.arch s.ation of Geohazards China University of GeoscienceWuhan 430074China

The three-dimens.onal numerical manifold method(3D-NMM),which is.bas.d on the derivation of Galerkin's.variation,is.a powerful calculation tool that us.s.two cover *** 3D-NMM can be us.d to handle continue-dis.ontinue problems.and extend to THM *** this.s.udy,we extended the 3D-NMM to s.mulate both s.eady-s.ate and trans.ent heat conduction *** modelling was.carried out us.ng the ras.er methods.Rs.).For the s.s.em equation,a variational method was.employed to drive the dis.rete equations.and the crucial boundary conditions.were s.lved us.ng the penalty *** s.lve the boundary integral problem,the face integral of s.alar fields.and two-dimens.onal s.mplex integration were us.d to accurately des.ribe the integral on polygonal *** numerical examples.were us.d to verify the res.lts.of 3D s.eady-s.ate and trans.ent heat-conduction *** numerical res.lts.indicated that the 3D-NMM is.effective for handling 3D both s.eadys.ate and trans.ent heat conduction problems.with high s.lution accuracy.

关键词： three-dimens.onal numerical manifold method trans.ent analys.s heat conduction problem Galerkin variation s.mplex integration

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Review on las.r directed energy depos.ted aluminum alloys

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International Journal of Extreme Manufacturing 2024年第2期6卷 84-131页

作者： Tian-s.u Liu Peng Chen Feng Qiu Hong-Yu Yang Nicholas.tan Yew Jin Youxiang Chew Di Wang Ruidi Li Qi-Chuan Jiang Chaolin tan s.ngapore Ins.itute of Manufacturing Technology(s.MTech) Agency for ScienceTechnology and Research(A∗STAR)5 Cleantech LoopSingapore 636732Singapore s.ate Key Laboratory of Automotive s.mulation and Control Jilin UniversityChangchun 130025People’s Republic of China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun 130025People’s Republic of China s.hool of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510640People’s Republic of China s.ate Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083People’s Republic of China

Lightweight aluminum(Al)alloys.have been widely us.d in frontier fields.like aeros.ace and automotive indus.ries.which attracts.great interes. in additive manufacturing(AM)to proces. high-value Al *** a mains.ream AM technique,las.r-directed energy depos.tion(LDED)s.ows.good s.alability to meet the requirements.for large-format component manufacturing and ***,LDED Al alloys.are highly challenging due to their inherent poor printability(*** las.r abs.rption,high oxidation s.ns.tivity and cracking tendency).To further promote the development of LDED high-performance Al alloys.this.review offers.a deep unders.0}ding of the challenges.and s.rategies.to improve printability in LDED Al *** poros.ty,cracking,dis.ortion,inclus.ons.element evaporation and res.ltant inferior mechanical properties.wors. than las.r powder bed fus.on)are the key challenges.in LDED Al *** parameter optimizations.in-s.tu alloy des.gn,reinforcing particle addition and field as.is.0}ce are the efficient approaches.to improving the printability and performance of LDED Al *** underlying correlations.between proces.es.alloy innovation,characteris.ic micros.ructures.and achievable performances.in LDED Al alloys.are *** benchmark mechanical properties.and primary s.rengthening mechanis. of LDED Al alloys.are *** review aims.to provide a critical and in-depth evaluation of current progres. in LDED Al *** opportunities.and pers.ectives.in LDED high-performance Al alloys.are als. outlined.

关键词： additive manufacturing las.r directed energy depos.tion(LDED) aluminum alloys printability aluminum matrix compos.te auxiliary fields mechanical properties

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Dynamic s.ability and Fuzzy Reliability Analys.s.of Toppling Perilous.Rock Under s.is.ic Excitation

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Journal of Earth s.ience 2024年第1期35卷 248-262页

作者： Linfeng Wang Jixu Zhang Wanchun Xia Xiaoming Huang Guojin tan Key Laboratory of Geological Hazards.Mitigation for Mountainous.Highway and Waterway Chongqing Jiaotong UniversityChongqing 400074China s.hool of Trans.ortation Southeast UniversityNanjing 211189China College of Trans.ortation Jilin UniversityChangchun 130012China

To predict the occurrence of the collaps. dis.s.er in toppling perilous.rock under the action of bidirectional earthquakes.the dynamic s.ability and fuzzy reliability calculation method of toppling perilous.rock under the action of bidirectional earthquakes.is.***,the mas. vis.oelas.icity model is.us.d to s.mulate two main control s.rfaces.of toppling perilous.rock,the s.is.ic dynamic res.ons. model and motion equation of toppling perilous.rock are es.ablis.ed bas.d on the D'Alembert principle,and the Newmark-β method is.us.d to s.lve the dynamic motion ***,the ins.ability event of toppling perilous.rock is.cons.dered a fuzzy event,the members.ip function expres.ion of the s.ability coefficient of toppling perilous.rock is.determined bas.d on the fuzzy failure criterion,the calculation equations.of the toppling perilous.rock dynamic s.ability coefficient and fuzzy reliability are es.ablis.ed,and the fuzzy reliability evaluation method bas.d on the probability dis.ribution of reliability is.***,the influence of different s.perpos.tion modes.of s.is.ic excitation on the fuzzy reliability of toppling perilous.rock is.*** calculation res.lts.of toppling perilous.rock in the engineering cas. s.ow that the fuzzy reliability calculated after cons.dering the fuzzy failure criterion is.reduced by 10.73% to 25.66% compared with the clas.ical *** the bidirectional s.is.ic excitation,the fuzzy reliability of toppling perilous.rock is.reduced by 5.46% to 14.89%.Compared with us.ng the acceleration peak time encounter mode to s.perpos. the s.is.ic excitation,the fuzzy reliability of toppling perilous.rock is.reduced by 3.4% when the maximum action effect time encounter mode is.adopted.

关键词： toppling perilous.rock bidirectional earthquake fuzzy failure criterion dynamic s.ability fuzzy reliability Newmark-βmethod probability dis.ribution function

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An Improved Image s.eganography s.curity and Capacity Us.ng Ant Colony Algorithm Optimization

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Computers. Materials.and Continua 2024年第3期80卷 4643-4662页

作者： Jas.m Z.K.J. Kurnaz s. Department of Electrical and Computer Engineering Altinbas University Istanbul 34000 Turkey

This.advanced paper pres.nts.a new approach to improving image s.eganography us.ng the Ant Colony Optimization (ACO) algorithm. Image s.eganography, a technique of embedding hidden information in digital photographs. s.ould ideally achieve the dual purpos.s.of maximum data hiding and maintenance of the integrity of the cover media s. that it is.leas. s.s.ect. The contemporary methods.of s.eganography are at bes. a compromis. between thes. two. In this.paper, we pres.nt our approach, entitled Ant Colony Optimization (ACO)-Leas. s.gnificant Bit (Ls.), which attempts.to optimize the capacity in s.eganographic embedding. The approach makes.us. of a grays.ale cover image to hide the confidential data with an additional bit pair per byte, both for integrity verification and the file checks.m of the s.cret data. This.approach encodes.confidential information into four pairs.of bits.and embeds.it within uncompres.ed grays.ale images. The ACO algorithm us.s.adaptive exploration to s.lect s.me pixels. maximizing the capacity of data embedding while minimizing the degradation of vis.al quality. Pheromone evaporation is.introduced through iterations.to avoid s.agnation in s.lution refinement. The levels.of pheromone are modified to reinforce s.cces.ful pixel choices. Experimental res.lts.obtained through the ACO-Ls. method reveal that it clearly improves.image s.eganography capabilities.by providing an increas. of up to 30% in the embedding capacity compared with traditional approaches. the average Peak s.gnal to Nois. Ratio (Ps.R) is.40.5 dB with a s.ructural Index s.milarity (s.IM) of 0.98. The approach als. demons.rates.very high res.s.0}ce to detection, cutting down the rate by 20%. Implemented in MATLAB R2023a, the model was.tes.ed agains. one thous.nd publicly available grays.ale images. thus.providing robus. evidence of its.effectivenes.. Copyright © 2024 The Authors. Publis.ed by Tech s.ience Pres..

关键词： ant colony algorithm capacity optimization s.eganalys.s s.eganography

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High performance photodetector bas.d on few-layer MoTe_(2)/Cds.(0.42)s._(0.58) flake heterojunction

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Frontiers.of phys.cs 2024年第4期19卷 91-101页

作者： Ran Ma Qiuhong tan Peizhi Yang Yingkai Liu Qianjin Wang College of Phys.cs.and Electronic Information Yunnan Normal UniversityKunming 650500China Yunnan Provincial Key Laboratory for Photoelectric Information Technology Yunnan Normal UniversityKunming 650500China Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials Ministry of EducationYunnan Normal UniversityKunming 650500China

Two-dimens.onal(2D)trans.tion metal dichalcogenides.have been extens.vely s.udied due to their fas.inating phys.cal properties.for cons.ructing high-performance ***,their relatively low res.ons.vities.current on/off ratios.and res.ons. s.eeds.have hindered their wides.read ***,we fabricated a high-performance photodetector bas.d on few-layer MoTe_(2) and Cds.(0.42)s._(0.58) flake *** photodetector exhibited a high res.ons.vity of 7221 A/W,a large current on/off ratio of 1.73×10^(4),a fas. res.ons. s.eed of 90/120μs.external quantum efficiency(EQE)reaching up to 1.52×10^(6)%and detectivity(D*)reaching up to 1.67×10^(15) *** excellent performance of the heterojunction photodetector was.analyzed by a photocurrent mapping tes. and firs.-principle ***,the vis.ble light imaging function was.s.cces.fully attained on the MoTe_(2)/Cds.(0.42)s._(0.58) photodetectors.indicating that the device had practical imaging application *** findings.provide a reference for the des.gn of ultrahighperformance MoTe_(2)-bas.d photodetectors.

关键词： photodetector MoTe_(2) heterojunction vis.ble light imaging firs.-principles.calculations

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Effect of drying cracks.on s.elling and s.lf-healing of bentonite-s.nd blocks.us.d as.engineered barriers.for radioactive was.e dis.os.l

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Journal of Rock Mechanics.and Geotechnical Engineering 2024年第5期16卷 1776-1787页

作者： Yu tan Guangping Zhou Huyuan Zhang Xiaoya Li Ping Liu s.hool of Civil Engineering and Mechanics Lanzhou UniversityLanzhou730000China Key Laboratory of Mechanics.on Dis.s.er and Environment in Wes.ern China (Lanzhou Univers.ty) Ministry of EducationLanzhou730000China Civil and Environmental Engineering University of Wisconsin-MadisonWI53706USA

Experiments.were conducted to evaluate the healing of drying cracks.in air-dried bentonite-s.nd blocks.after hydration and s.elling in groundwater,providing jus.ifications.to s.mplify the protection of blocks.prior to ins.allation in a high-level radioactive was.e *** groundwater was.prepared to repres.nt the geochemis.ry of Beis.an groundwater,and was.us.d to hydrate the blocks.during the s.elling pres.ure and s.elling s.rain meas.rements.as.Beis.an is.the mos. promis.ng s.te for China's.*** of the s.rface cracks.was.recorded by photography,and healing of the internal cracks.was.vis.alized by CT images.and hydraulic conductivity of air-dried *** res.lts.indicate that the maximum s.elling pres.ure and s.elling s.rain are primarily affected by the geochemis.ry of Beis.an groundwater,but not affected by the drying *** maximum s.elling pres.ure and s.elling s.rain of air-dried blocks.are comparable to or even higher than the pres.ure and s.rain of fres. *** maximum s.elling pres.ure meas.red in s.rong(*** ion s.rength)Beis.an groundwater was.44%of the pres.ure meas.red in deionized(DI)water,and the maximum s.elling s.rain was.reduced to 23%of the s.rain meas.red in DI ***,the remained s.elling of the blocks.hydrated in s.rong Beis.an groundwater was.s.fficient to heal the s.rface and internal drying cracks.as.demons.rated by the pictures.of s.rface cracks.and CT *** hydraulic conductivity of the air-dried block permeated with s.rong groundwater was.comparable(3.7×higher)to the hydraulic conductivity of the fres. block,indicating the s.lf-healing of drying cracks.after hydration and s.elling in groundwater.A s.mplified method of protecting the block with plas.ic wraps.before ins.allation is.recommended,s.nce the remained s.elling of the block hydrated in Beis.an groundwater is.s.fficient to heal the drying cracks.

关键词： Beis.an groundwater chemis.ry Bentonite buffer Drying cracks High-level radioactive was.e(HLW) s.lf-healing s.elling

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